<ul atMenu [atType]="'vertical'" style="width: 240px">
  <li atMenuItem [active]="true">
    <div title>导航1</div>
  </li>
  <li atMenuItem>
    <div title>导航1</div>
  </li>
  <li atMenuItem>
    <div title>111</div>
  </li>
  <li atSubMenu>
    <div title>导航3</div>
    <ul itemGroup>
      <li atMenuItem>
        <div title>2层导航</div>
      </li>
      <li atSubMenu>
        <div title>导航3</div>
        <ul itemGroup>
          <li atMenuItem>
            <div title>
              <atPopover>
                <span popTrigger>asd</span>
                <div popContent>
                  fuck u
                </div>
              </atPopover>
            </div>
          </li>
        </ul>
      </li>
    </ul>
  </li>
</ul>
